The single crystals of diamond grown by chemical vapor deposition (CVD) are getting wider acceptance in the market for gem purposes and various other applications. Most popular applications gems, particle detectors, high pressure anvils, laser windows. It is widely accepted that, unless specifically made, CVD type IIa, which implies that they have a nitrogen concentration less than 5 ppm diamon...

Diamond etching in high-temperature ambient-pressure experiments has been performed aimed to assess possible postimpact effects on diamonds impact craters, for the case of Popigai crater Yakutia (Russia). The with different etchants, including various combinations silicate melts, air, and inert gases, demonstrated diversity microstructures {111} diamond faces: negative or positive trigons, as w...

In 2003, the Kimberley Process Certification Scheme (KPCS) went into force to stop trade in those diamonds, directly linked fueling of armed conflict and activities rebel movements, also known as diamonds. This article gives empirical evidence on impact KPCS international rough We find that bilateral participation facilitates access markets for diamonds increases values. The does not depend exp...

We establish the consistency of the failure of the diamond principle on a cardinal κ which satisfies a strong simultaneous reflection property. The result is based on an analysis of Radin forcing, and further leads to a characterization of weak compactness of κ in a Radin generic extension.

Impact diamonds were found in several inipactites from the Ries crater. Geriiiaiiy including fallout and fallback (crater f i l l ) suevites. a glass bomb, impact melt i-ock and shocked gneiss. These diamonds formed two distinct grain size populations: 50-300 pii apographitic. platy aggregates with surface ornamentation and etching that \vere observed using optical and scanning electron microsc...